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Rohm Referencedesigns

REFACDC015 - Reference Design

Non-Isolated Buck Convertor 7.2 W 12 V Output 25kHz

This reference design uses the BM2PAB1Y-Z.

  • 1.Adjustable Output Voltage with External Resistor
  • 2. Low Switching Loss and Low EMI by frequency 25 kHz
  • 3. Internal Start up Circuit 730V(peak)
  • 4. Internal Super Junction FET 730V(peak) (Ron = 1.2Ω)
  • 5. Internal Current Sense Resistor (Detection Current 1.76A)
  • 6. Contributes to Low EMI by Internal Hopping Function


Design Resources



Board Number Input Voltage Range Input Frequency Output Voltage Maximum Output Power Output Current Range Stand-by Power Efficiency Output Ripple Voltage Size Operating Temperature
BM2PAB1Y-EVK-001 90 to 264Vac 47 to 63Hz 12.0V(Typ.) 7.2W 0 to 0.6A *1 120mW Iout=0A 0.82 100mVpp *2 70mm x 30mm -10 to 65deg.C
*1 Please adjust operating time, within any parts surface temperature under 105 °C
*2 Not include spike noise

Distribution Inventory

Board Number Distributor Quantity Available
BM2PAB1Y-EVK-001 Mouser Electronics Inc. 5
Chip One Stop, Inc. 2
DigiKey 2
Ameya Holding Limited 1
CoreStaff Co., Ltd. 1

Key Components

Board Number Part Number Product Category Datasheet Status SPICE LTspice® ? Thermal Model Symbol & Footprint 3D STEP Samacsys ECAD Library Calc Tool ROHM Solution Simulator
BM2PAB1Y-EVK-001 BM2PAB1Y-Z AC/DC Converters ICs - Recommended - - - -
BM2PAB1Y-EVK-001 RFU02VSM6S Fast Recovery Diodes - Recommended - - - - -